KR19990016997U - Projection TV's barrel assembly - Google Patents

Abstract

The present invention relates to a projection TV in which a projector is built using an AMA module, and includes a first barrel and a second barrel including a plurality of projection lenses in front of the projector, the inner circumference of the first barrel and the second barrel. One end of the outer circumference is engaged to be rotatably installed, and a driving means and an operation switch for rotating the first barrel are provided, and a power transmission for rotating the first barrel by transmitting a driving force of the driving means. Means are provided.

Therefore, according to the present invention, the driving force of the drive motor driven in accordance with the operation of the operation switch is transmitted to the first barrel by the power transmission means can move the first barrel in the front and rear direction to adjust the focus, so that the user or the operator to focus This eliminates the need to dismantle the cabinet of the projection TV to adjust, resulting in improved maintainability.

Description

Projection TV's barrel assembly

The present invention relates to a projection TV using an actuated mirror array, and more particularly to an improved barrel assembly to facilitate adjustment of the focus of the barrel.

In general, a device for projecting optical energy onto a screen includes a direct-view image display device and a projection-type image display device according to a method of displaying optical energy on a screen. type image display device).

An example of a direct-view image display apparatus is a cathode ray tube (CRT), which is a so-called CRT device, which has excellent image quality but increases in weight and volume as the size of the screen increases, leading to an increase in manufacturing cost. There is.

Projection type image display devices are referred to as liquid crystal displays (hereinafter referred to as LCDs), deformable mirror devices (hereinafter referred to as DMDs), and actuated mirror arrays (hereinafter referred to as AMAs). ).

Since the LCD has a very simple optical structure, it can be thinly formed to reduce the weight and the volume. However, due to the polarity of light, the light efficiency is low, and there is a problem inherent in the liquid crystal material, for example, a slow response speed and a disadvantage in that the inside is easily overheated. In addition, the maximum light efficiency of existing transmission light modulators is limited to a range of 1 to 2% and requires dark room conditions to provide acceptable display quality.

Optical modulators such as DMD and AMA have been developed to solve the problems of the aforementioned LCD type optical modulators.

DMD shows a relatively good light efficiency of about 5%, but serious fatigue problems are caused by the hinge structure employed in the DMD. In addition, there is a disadvantage that a very complicated and expensive driving circuit is required.

In contrast, AMA is a piezoelectrically driven mirror array that provides light efficiency of 10% or more. In an AMA light modulator, each actuator generates a deformation in accordance with an electric field generated by an applied electric image signal and a bias voltage. When the actuator causes deformation, each of the mirrors mounted on the actuator is inclined to reflect the light incident from the light source at a predetermined angle.

The AMA optical modulator has a simple structure and operation principle, and can obtain high light efficiency compared to LCD or DMD. It also provides enough contrast to provide a bright and clear image under normal room temperature light conditions. Moreover, it is not only affected by the polarity of the incident light, but also by the polarity of the reflected light. In addition, the reflective properties of the AMA are relatively less sensitive to temperature, which has the advantage of improving the brightness of the screen compared to other devices that are easily affected by high power light sources.

Such a projection TV using AMA is disclosed in Korean Utility Model Application No. 96-19194 filed by the present applicant on June 29, 1996.

1 is a schematic cross-sectional view showing a projection TV filed by the applicant.

As shown, the conventional projection TV is provided with a screen 11 on the front of the cabinet 10, the rear cover (rear cover 12) is mounted on the back of the cabinet (10).

In addition, a projector 13 for projecting light is provided under the cabinet 10, and a main mirror 14 for reflecting light projected from the projector 13 is inclined at a predetermined angle to cover the rear cover 12. Is mounted on.

The light reflected by the reflection of the main mirror 14 is projected onto the screen 11 of the cabinet 10 as an image.

On the other hand, Figure 2 is a cross-sectional view showing a barrel assembly of a conventional projector, the barrel assembly 15 is divided into a first barrel 21 and a second barrel 22, each barrel inside a predetermined diameter and characteristics Projection lenses (L) having a structure is provided, and the coupling portion of the first barrel 21 and the second barrel 22 is engaged to rotate the first barrel in an arbitrary direction so that the first barrel is moved forward and backward. The focus adjusting unit 23 is formed to adjust the focus while moving.

That is, after the projector 13 is installed in the projection TV, the light transmitted from the projector 13 is focused on the first barrel 21 so that the light can be formed into a predetermined image on the screen 11 via the main mirror 14. Assemble the projection TV with the

However, in the conventional projection TV, a shock is applied when moving a product or the focus of an image projected on the screen 11 during long-term use does not coincide. In order to adjust this, a user or a mechanic disassembles the projection TV. There was an inconvenience to adjust the barrel assembly 15 after exposing the projector 13.

Accordingly, an object of the present invention is to provide a barrel assembly of a projection TV that can adjust the focus of the projection light projected from the projector even without disassembling the cabinet of the projection TV.

In order to achieve the above object, the present invention provides a projection TV in which a projector is built using an AMA module, wherein a first barrel and a second barrel including a plurality of projection lenses are installed in front of the projector, and the first barrel is provided. One end of the inner circumference of the outer and outer circumference of the second barrel is fitted to be rotatable, and a drive means and an operation switch for rotating the first barrel is provided, and transfers the driving force of the drive means to the first It provides a power transmission means for rotating the barrel.

The power transmission means has a bracket fixed to one end of the projector, a screw rod is installed in the bracket to convert the rotational movement of the drive motor into a spiral movement, is fitted into the spiral groove of the screw rod and the outer circumference of the first barrel Characterized in that consisting of the gear means formed in.

According to the barrel assembly of the projection TV of the present invention, the driving force of the driving motor driven by the operation of the operation switch is transmitted to the first barrel by the power transmission means, so that the focus can be adjusted while the first barrel is moved forward and backward. This eliminates the need for the user or mechanic to disassemble the projection TV's cabinet to adjust focus, which can result in improved serviceability.

1 is a schematic cross-sectional view showing a conventional projection TV;

2 is a cross-sectional view showing a barrel assembly of a conventional projector;

3 is a cross-sectional view showing a barrel assembly of a projector according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10; Cabinet 11; screen

12; Rear cover 13; Projector

14; Main mirror 20; Barrel assembly

21; First barrel 22; Second barrel

23; Focus control unit 30; Drive motor

31; Operating switch 32; Pinion gear

40; Power transmission means 41; Screw rod

42; Bracket 43; Driven gear

44; Spiral groove 45; Gear

Hereinafter, a preferred embodiment of the barrel assembly of the projection TV according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing the structure of the screen assembly of the projection TV according to the present invention, the basic configuration of the projector described in Figure 1 will be described with the same reference numerals.

First, referring to FIG. 1, the projection TV has a rear cover 12 mounted on the rear surface of the cabinet 10, and a projector 13 for transmitting light to the lower portion of the cabinet 10 is installed. In addition, a main mirror 14 for reflecting light emitted from the projector 13 is mounted to the rear cover 12 at a predetermined angle.

In particular, the front surface of the projector 13 is composed of a first barrel 21 and a second barrel 22, one end of the inner circumference of the first barrel 21 and the outer circumference of the second barrel 22 is engaged. The focus adjusting unit 23 is installed to be rotatable, and a driving motor 30 and an operating switch 31 for rotating the first barrel 21 are provided, and a driving force of the driving motor 30 is provided. A barrel assembly 20 having a power transmission means 40 for transmitting the rotational movement of the first barrel 21 is installed.

The drive motor 30 is installed to be driven in the forward and reverse direction by receiving power from the main power supply of the projection TV, the operation switch 31 is installed outside the cabinet 10 of the projection TV to operate the drive motor 30. Adjust

The power transmission means 40 is provided with a screw rod 41 engaged with the pinion gear 32 of the drive motor 30, a bracket 42 for supporting the screw rod 41 is installed, the screw The rod 41 includes a driven gear portion 43 meshing with the pinion gear 32 and a spiral groove portion 44 having a spiral groove formed in a longitudinal direction.

On the other hand, the gear portion 45 is formed along the outer periphery of the first barrel 21 is coupled to the spiral groove 44, the first barrel 21 is fixed to the second barrel 22 as in the prior art The focus control unit 23 is formed to be linearly moved in the direction of the optical axis while being engaged with the end of the.

Here, the pitch of the spiral groove portion 44 and the pitch of the focus adjusting portion 23 are formed to have the same distance from each other, the gear portion 45 of the first barrel 21 moving along the focus adjusting portion 23. ) And the screw rod 41 which transmits the driving force do not interfere with each other during operation.

Hereinafter, the operation and effects of the present invention will be described.

When the driving motor 30 is operated, the driving force of the driving motor 30 is transmitted to the driven gear part 43 of the screw rod 41 by the pinion gear 32 to rotate the screw rod 41. The rotation of the screw rod 41 is transmitted by the rotation of the spiral groove 44 to rotate the gear 45 of the first barrel 21 coupled thereto. The rotation of the gear part 45 is transmitted by the rotation of the first barrel 21, and the rotation of the first barrel 21 is rotated along the focus adjusting part 23 engaged with the second barrel 22, while the optical axis direction is rotated. Linear motion occurs.

On the other hand, the movement of the first barrel 21 brings about a change in the distance between the plurality of projection lenses (L) installed in the barrel assembly 20, the focus is changed.

In this way, the focus can be arbitrarily adjusted by operating the operation switch 31 formed on the outside of the cabinet 10 of the projection TV so that the focus is shifted due to physical shock received during product movement or when the focus changes in the course of long-term use. You can easily refocus.

The above-described embodiment is merely to describe one preferred embodiment of the present invention, the scope of the present invention is not limited to this, and can be changed as appropriate within the scope of the same thought.

As described above, according to the present invention, the driving force of the driving motor driven by the operation of the operation switch is transmitted to the first barrel by the power transmission means so that the focus can be adjusted while moving the first barrel in the front and rear directions so that the user or the operator can focus. This eliminates the need to dismantle the cabinet of the projection TV to adjust, resulting in improved maintainability.

Claims (3)

In a projection TV in which a projector is built using an AMA module, a first barrel and a second barrel including a plurality of projection lenses are provided in front of the projector, the inner circumference of the first barrel and the outer circumference of the second barrel. The focus control unit is installed so that one end of the fitting is rotatable, and a driving means and an operation switch are provided to rotate the first barrel, and a power for transmitting the driving force of the driving means to rotate the first barrel is rotated. The barrel assembly of the projection TV provided with a delivery means. According to claim 1, wherein the power transmission means is a bracket is fixedly installed on one end of the projector, a screw rod for converting the rotational movement of the drive motor into a spiral movement is installed in the bracket, the screw rod is meshed with the spiral groove of the screw rod The barrel assembly of the projection TV, characterized in that the gear means formed around the outer periphery of the barrel. 3. The barrel assembly of a projection TV according to claim 2, wherein the screw rod comprises a driven gear part engaged with the pinion gear and a spiral groove part formed with a spiral groove in a longitudinal direction.